Cemented total hip prosthesis

Category: Archive File prosthetics Surgical operations
Tag: #bone #femur #hip #prosthetics

Over the years, but not only, the joints lose elasticity and arthrosis phenomena can occur which cause pain, up to a poor mobility of the patient. In these cases, a hip prosthesis similar to the one visible in the radiograph to the side is used. The procedure itself is quite simple and takes about an hour. The most delicate and complicated phase is the planning of the intervention itself, in which the correct position and inclination of the prosthesis which will replace the bone must be calculated. Planning is done based on x-rays on which transparencies are superimposed with the various prostheses available to find the most suitable size. Misjudgment at this stage could result in incorrect prosthesis angulation, which would result in the patient walking abnormally upon discharge. For the total replacement of the hip joint, non -cemented titanium alloy prostheses are used, which allow the patient to walk again after a maximum of 3 or 4 days after the operation. Furthermore, the non-cementification of the plant is an advantage because the polymer glues used are highly toxic and cause necrosis. [ Continuing in the article, all the main phases of the intervention are illustrated and by their nature they are not suitable for "sensitive" people ]

cementless prosthesis and cup

Over a titanium alloy prosthesis. Note the " rough " part of the stem which promotes the osseointegration of the implant. At this point, the data, previously obtained in the preoperative phase, are reported with a felt-tip pen on the patient's leg.

hip surgery location

After that we move on to the actual operation by incision of the skin and making the femur come out of its seat.

skin incision

The surgeon uses the electric scalpel and assisted with forceps to approach the femur.

approach to the femoral head with an electric scalpel

Once the area of interest has been reached, fixed retractors are positioned which guarantee the orthopedic surgeon a wide and stable operating field.


Once the femur is reached, the head is exposed and prepared for the next step.

femur head

At this point the end of the femur is cut with an electric jigsaw. In the photo the surgeon is holding the head of the femur that has just been removed in his hand.

femoral head cut

Once the femoral head has been cut, the housing of the acetabular cup is prepared with a kind of drill which scrapes off the cartilage and a part of the bone.

acetabular cup scraping

This is the result that is obtained once the scraping is completed.

hip acetabular cup

With a mallet, the surgeon fits the acetabular cup into the bone, always checking the correct positioning.

acetabular cup insertion

Now the orthopedist drills the femur, thus extracting the marrow, to prepare the femoral canal which will house the stem of the prosthesis. The hole is made smaller than the actual size of the prosthesis, to ensure immediate sealing and cohesion.

femoral canal opening

Once this operation has been completed, the pressure prosthesis is inserted and the limb is attempted to move to make sure that everything has been done in a workmanlike manner.

prosthesis head and cup

Barring unforeseen circumstances, the tissues are repositioned and the cut is sutured. Research at the moment is focused on finding increasingly biocompatible and long-lasting materials. In fact, one of the major limitations is the duration of this device which is currently around 20 years and sometimes even 30. After this period of time, the prosthesis must be re-interventioned and replaced. The second operation is always more difficult than the first, because the bone loses consistency and weakens.

Published: 2022-12-28From: Marketing

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